Archelatjs v



A'. V. STEWART. Hinged Slate.

N0.-224',965. Palten'fed Feb. 24,1880.

Az vena 1L N. PErERs, PHOTO-UTHOGRAPHER. wA

UNITED STATES PATENT OFFICE.

AEoHELAUs v. sTEwAET, oE CINCINNATI, oHIo, AssIeNoE To EosA B.

. I- EAPP, or sAME PLACE.

HINGED SLATE.

SPECIFICATION forming part of Letters Patent No. 224,965, dated February 24, 1880. Application filed August 30, 1879.

To all whom 'it may concern:

Be it known that I, ARCHELAUs V. STEW- ART, of Cincinnati, in the county of Ham ilton and State of Ohio, have invented a new and Improved Reversible Slate; and I do hereby declare that the following is a full, clear, and exact description of the same, reference lbeing had to the annexedy drawings, making a part of this specification.

Figure l is a perspective of my improved reversible slate vpartly opened. Fig. 2 is a section through line a' of Fig. l, showing slate extended, also the same folded in dotted lines. Fig. 3 shows modification, where the ieXible member is made of two pieces and the corrugations placed between them. Fig. 4 repre sents another modification, where the iiexible member consists of a tubular strap holding the slates together, being' passed over pins or studs, the corrugations being placed as in Fig. 3. Fig. 5 is a section of Fig. 4 on line y through the iiexible tubular straps.

The nature of my invention relates to a rcversible slate, having for its object the articulation of the two slates or members, so that they may be folded back to back, and the reverse, presenting` a finished and handsome appearance, and noiseless in its action.

As constructed, the two slates always re main parallel with each other, the sagging of the slatesbeing entirely obviated.

This invention consists in the combination, with slate-frames having certain corrugated bearings, of an intermediate exible connectin gstrip, as will be fully described hereinafter.

In construction my invention is as follows:

' A A are the two slates hinged together. a 'a are segmental gearin gs or corrugations fastened on the edges of the slate, near the corners, as shown in `the drawings. The pitch-line of the gearings is on a line with the outer surface y ofthe frame. AtB is an elastic web, which is let intoand fastened iirmly, by means of rivets or otherwise, inthe center of the edge of the frame, running longitudinally from one set of gearings to the other.

In Figs. l and 2 it is shown that the original frame is not out away, except what is done to give place to the flexible member and a point for attaching they` gearings, which are placed on the edge of the frame, as represented in Fig. l. `This construction leaves an opening between the two frames, when the slates are extended, equal to the thickness of one frame, but is iilled by the flexible elastic web B. This web may be made non-elastic when, so desired, and so long as it does not stretch by useit will act its part well; but I prefer to make the joining member longitudinally elastic as well as flexible, which will hold the corrugations firmly together and prevent any noise or looseness in the structure.

In Fig. 3 I show a modilication, where, instead of the web Bin one continuous strip, I place two narrow strips, B', one at each end, and the corrugations in the center. In this case it may be preferable to cut a recess into theframes to make room for 4the flexible strips,

and corrugate the frame itself, in which case the frame is enlarged where the corrugations are made, so that a portion of the cogs may extend beyond the surface of the frame, so as to keep the two slates in engagement when folded.

Another modification is shown in Figs. 4 and 5. Here the corners of the frame are cut I away and a segmental gearing, D, placed in the space made, which gearings are provided with around tenon, d, to receive the tubular strap E, holding the two slates together as effectually as the web B.

It Will be observed that the gearings, as herein shown, can also be adopted on any ordinary' wirelink or metalplate reversible hinges, in all of which the sagging of the two slates is prevented and a noiseless, smooth,

and parallel action is secured.

The operation of my invention becomes obvious from the foregoing, and requires no further explanation.

What I claim as my invention, and desire to secure by Letters Patent, is-

In combination with slate-frames havin g corrugated bearings, substantially as described, an intermediate iiexible connecting-strip uniting the frames together, as set forth.

AROHELAUS V. STEWART.

Attest: T. VAN KANNEL, WALTER S. MOSER. 

